High Quality & Large LCD Backlight Display And Prevent Eyes weariness The Handheld HVAC Manometer is made of ABS material, and the excellent performance of high-temperature resistance and impact resistance makes the air pressure meter have a long service life. 4.45CM4.95CM display, support LCD backlight, convenient lighting operation, display data clearer and easier to read.Storage Function & Reminder Function The Digital Pressure Gauge with Backlight has storage function, it can store data in time, support data retention and DIF mode, and can record data easily.In addition, it also has low battery reminder function, which can promptly warn when the battery is low, allowing you to grasp the charging time.Response Time: 0.5Seconds, Over Range Indicator;Err 0 , Under Range Indicator Err1 Temperature; -40 to 80 c (-40- 176F) Operating Conditions; 0 to 50 C (32 to 122F)Repeatability: 0.2% (MAX0.5%FSO) Linearity / Hysteresis: 0.29%FSO Measuring Range: 20.68 kPa / 2.999 psi , Accuracy: 0.3% FSO (at 25 OC)3-Year Warranty Manometer For damages caused by non-human factors, promise to resend gas pressure tester manometer parts for free within 3 years. For any needs, you are warmly welcome to contact us and we will get back to you ASAP within 24 hours.